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1992 968 Excess pressure in fuel tank

Fuel System

Vehicle Information: Model(924/944/968): 968; Year: 1992; Body Type: Coupe; Total Mileage: 104000;

I've been tracking the car about four years (also street car.) Saturday (72 degrees) between track sessions I went out for gas. I removed the cap and air came whooshing out of the tank for a full 30 seconds, so strong that if I tried to pump fuel in before it stopped it would spit back out at me. Car ran fine before and after. At the end of the day I loosened the cap and had the same release of pressure. I don't understand all the valves associated with the evaporative canister so don't know where to look first.

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